Recession vs marginal myotomy surgery for strabismus: effects on spatial localization

Area of Science:

• Ophthalmology
• Neuroscience
• Biomechanics

Background:

• Palisade endings (PEs) are sensory receptors at the eye muscle's musculotendinous junction.
• These PEs are hypothesized to provide proprioceptive information about eye position.
• The musculotendinous junction is a common site for strabismus surgical interventions.

Purpose of the Study:

• To investigate the role of palisade endings in proprioception of eye position.
• To compare the proprioceptive effects of two different surgical procedures for medial rectus weakening: marginal myotomy and recession.
• To assess the impact of these surgeries on eye-hand coordination.

Main Methods:

• Two groups of children undergoing their first medial rectus weakening surgery were studied.
• Eye-hand coordination was tested using open-loop pointing responses before and after surgery.
• The effects of marginal myotomy versus recession surgery on these tests were compared.

Main Results:

• Surgical procedures impacted eye-hand coordination, indicating a disruption of proprioceptive input.
• Marginal myotomy resulted in a greater degree of proprioceptive de-afferentation compared to recession surgery.
• This difference is attributed to the extent of palisade ending disruption during each procedure.

Conclusions:

• Palisade endings play a significant role in providing proprioceptive feedback for eye position.
• Marginal myotomy is more disruptive to this proprioceptive function than recession surgery.
• Understanding PE disruption is crucial for optimizing strabismus surgical outcomes and visual rehabilitation.